Research On Impact Force And Strain Of Bridge Pier Caused By Vehicle Collision

With the rapid development of urban transportation, accidents caused by vehicle collision haven become more and more frequent. At present, relevant research achievements about this question are few. Change rules of strain and impact force on bridge piers caused by collision between vehicle and bridge piers have been studied by model test and finite element method in this paper. Main research works are as follows:1) The existing computing methods of vehicle impact force and relevant regulations about impact force in different codes have been summarized.2) A scale test model of vehicle crash bridge piers has been established. Multiple sets of direct impact testes under different conditions have been accomplished. The way concrete and steel strain in bridge pidrs under different vehicle speed, weight and measurement position has been analyzed. The strain history has been divided into four stages. Then the development of bridge piers’upper boundary conditions and capacity of energy absorption and dissipation have been analyzed. Impact force of bridge piers has been calculated out by using existing methods.3) Process of collision between vehicle and bridge piers has been simulated by finite element method based on ANSYS/LS-DYNA. The change law of impact force history has been analyzed. The equivalent impact force has been calculated out and compared with the relevant value in different codes. The development rules of stress in bridge piers under the action of impact force have also been studied.Finally, the content and conclusions of this paper have been summarized, the existing problems have been pointed out, and advice for future research has been given.